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@article{DE_1967_3_1_a10, author = {Yu. Ya. Kim}, title = {On the spectrum of a differential operator connected with a mixed problem}, journal = {Differencialʹnye uravneni\^a}, pages = {109--113}, publisher = {mathdoc}, volume = {3}, number = {1}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1967_3_1_a10/} }
Yu. Ya. Kim. On the spectrum of a differential operator connected with a mixed problem. Differencialʹnye uravneniâ, Tome 3 (1967) no. 1, pp. 109-113. http://geodesic.mathdoc.fr/item/DE_1967_3_1_a10/